18．
0 161752 161760 161766 161770 161776 161778 161782 161788 161790 161796 161802 161806 161808 161812 161818 161820 161826 161830 161832 161836 161838 161842 161844 161846 161847 161848 161850 161851 161852 161854 161856 161860 161862 161866 161868 161872 161878 161880 161886 161890 161892 161896 161902 161908 161910 161916 161920 161922 161928 161932 161938 161946 199269
| 直接写得数： 1-0.25= | 3.4+1.6= | 4.3-0.8= | 2.7+8.4= | 0.76+0.03= |
| 0.8-0.37= | 1.32+1.8= | 2.84-1.7= | 2.8+2.2= | 10-3.6= |